Mud flap brace



FIG. 1 is a perspective view of a mud flap brace showing my new design it being understood that the broken line showing of a mud flap is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front elevation view thereof, the back or rear side being substantially plain and unornamented;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevation view thereof; and

FIG. 6 is an opposite side elevation view thereof. 

The ornamental design for a mud flap brace, as shown and described. 